myschkin: . . .
One of the earliest recorded instances of <4.Bc4> landed a reel big fish:
Lindehn - Steinitz (London, 1864)
1.e4 e5 2.d4 exd4 3.c3 dxc3 4.Bc4 Nf6
Here we have it officially: Steinitz didn't want the second pawn! This is worth pondering since Steinitz wasn't one to turn down free food. In his magisterial survey of the Danish, W. John Lutes calls this the Steinitz Defense. Given the further course of the game, however, perhaps Steinitz wouldn't have been so happy to have his name tied down to it.
In an earlier game, Lindehn had tried the bizarre looking 5.Ne2!?, apparently intending to meet 5...Nxe4 with 6.Bxf7+, etc. But this is too artificial to be convincing: taking the pawn on c3 is much more natural. Now with 5...Nc6 6.Nf3 we could transpose into a Goring, but Black has some other options here that do not transpose into the Goring or the Danish proper.
This is one of them. The pin carries a threat to win a pawn, but can Black really afford the time it would take to get it?
Apparently Lindehn thinks so, or he might try something like 6.Nf3 0-0 (but not 6...Nxe4 7.0-0! when White's compensation looks serious) and now 7.0-0!? or 7.Bg5 or 7.e5 all look worth exploring. Lindehn's move looks strange, but in 1925 Emanuel Lasker recommended Nge2 so it deserves serious attention.
6...0-0 7.e5 Ne4
It would be interesting to know what Lindehn had in mind in response to 7...d5, which is the standard response in such positions. For that matter, 7...Ng4 is interesting for Black as well.
8.0-0 Nxc3 9.bxc3 Bc5 10.Ng3 Nc6 11.Qh5 d6 12.Bg5 Qe8 13.exd6 cxd6 14.Rfe1
(14.Bf6! looks very strong, particularly with the followup 14...gxf6 15.Qh6!)
14...Ne5 15.Re4 Be6 16.Rh4 h6 17.Bxh6 Ng6 18.Bxg7!? 18.Kxg7 19.Qh6+ Kf6 20.Ne4+!?
(why not bring the last piece into the attack 20.Re1!?)
20...Ke7 21.Bxe6 fxe6 22.Qg5+ Kd7 23.Nxc5+! dxc5 24.Qxc5!
White's Queen creates a lovely mating net with little assist from Black's own pieces.
24...Qc8 25.Rd1+ Ke8 26.Qh5 Rg8 27.Qh7 (27.Rg4) 27...Ne7 28.Rf4
Arrr! Well done pirate Lindehn!